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HTTP server connecting to a Markov chain
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Feeding:
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# PUT /put
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Request body is fed to the chain
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NOTE: Strings fed to the chain must be valid UTF-8 and below 16 KB in size
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Generating:
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# GET /get
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Generate a string from the chain
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# GET /get/<number>
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Generate <number> strings from the chain
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NOTE: Number must be lower than 256
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# genmarkov
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HTTP server connecting to a Markov chain
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# Build requirements
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Unix & Rust nightly are currently requirements to build, for now.
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# Configuration
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When ran with no arguments, `markov` will attempt to load the config file at `markov.toml`. If it does not exist, it will use the default configuration. (On debug builds, it will also create the default `markov.toml`.)
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An example default configuration file is provided at [./markov.toml](markov.toml).
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When ran with an argument specifying the config file however, it will attempt to load that. If it fails to load the file, the default will be used.
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## Config file entries
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| Name | Description | Default | Optional |
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|-------------------------|---------------------------------------------------------|------------------|----------|
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| `bindpoint` | Address or Unix domain socket for the server to bind to | `127.0.0.1:8001` | No |
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| `file` | File to save and load the chain from | `chain.dat` | No |
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| `max_content_length` | Max request body length to allow | `4194304` (4MB) | No |
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| `max_gen_size` | Max number of strings for a request to generate at once | `256` | No |
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| `save_interval_secs` | Number of seconds to ensure waiting before saving chain | `2` | Yes |
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| `trust_x_forwarded_for` | Trust the `X-Forwarded-For` HTTP header | `false` | No |
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| `filter` | Remove characters from incoming and/or outgoing text | None | Yes |
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### AF_UNIX note
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When binding to a Unix domain socket, prefix the path with `unix:/` (e.g. `unix://var/markov.socket`)
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The server will not attempt to remove already existing sockets at the path, so ensure there isn't one before launching.
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## Logging
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Set the `RUST_LOG` environment variable to one of the following to switch runtime logging levels.
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* `trace` - Most verbose
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* `debug` - Verbose
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* `info` - Show input and output to/from the chain and requests
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* `warn` - Only show warnings (default)
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* `error` - Only show errors
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## Signals
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On Unix systems at runtime, some signals are trapped:
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| Signal | Description |
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|-----------|------------------------------------------------------------------------|
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| `SIGUSR1` | Immediately save the chain |
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| `SIGUSR2` | Immediately load the chain |
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| `SIGQUIT` | Ensure the chain is properly saved and then immediately call `abort()` |
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| `SIGINT` | Perform a full graceful shutdown |
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# Usage
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The server exposes several paths for access of the chain
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## Feeding
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### `PUT /put`
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Request body is fed to the chain
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#### NOTE
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Strings fed to the chain must be valid UTF-8 and a size below the value specified in the config file.
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## Generating
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### `GET /get`
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Generate a string from the chain
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### `GET /get/<number>`
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Generate `<number>` strings from the chain
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### `GET /get/sentance`
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Generate a single sentance from the chain
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### `GET /get/sentance/<number>`
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Generate `<number>` sentances from the chain
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#### NOTE
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Number of strings/sentances must be lower than the value specified in the config file.
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# License
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GPL'd with <3
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